The doctor, ________ by several nurses, successfully performed the difficult operation on the patient. 
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A
aided
B
assisted
C
helped
D
guided
推荐题目
 Mary devoted her life       the sick.
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A
to care for
B
caring for
C
to caring for
D
to have cared for
Only thirty percent of the graduates _____ state-run companies.
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A
have a talent for
B
finds a position
C
belongs to
D
have access to
You have made a few mistakes in your composition but ______ you have done well.
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A
as a whole
B
on the whole
C
on the other hand
D
generally speaking